Drupal drush : comment ajouter un champ lié à un vocabulaire

<?php
$vocabulary = new stdClass();
$vocabulary->name = 'PAA';
$vocabulary->description = 'Paa - Description';
$vocabulary->machine_name = 'paa';
$vocabulary->help = 'Vocabulaire related to Paa';
$vocabulary->nodes = array();
$vocabulary->weight = 0;
taxonomy_vocabulary_save($vocabulary);

$vmn = $vocabulary->machine_name;
$vvid = $vocabulary->vid;
$term = new stdClass();
$term->vid = $vvid;
$term->name = 'MonTerme';
$term->description = 'Description of terme';
$term->format = 'text';
$term->parent = 0;
$term->vocabulary_machine_name = $vmn;
taxonomy_term_save($term);

$field = array(
    'field_name' => 'test_mon_type', 
    'type' => 'text', 
);
field_create_field($field);

// Create the instance on the bundle.
$instance = array(
    'field_name' => 'test_mon_type',
    'entity_type' => 'taxonomy_term',
    'label' => 'Mon nom de champ',
    'bundle' => 'taxonomy', 
    'required' => TRUE,
    'widget' => array(
        'type' => 'textfield',
    ), 
);
field_create_instance($instance);